<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-04-02 -092 15:30:00.000"
URSICode="SAA0K"
StationName="SaoLuis"
GeoLatitude="-2.6"
GeoLongitude="315.8"
Source="Ionosonde"
SourceType="DPS-4"
ScalerType="auto">
<SystemInfo UMLStationID="903">
<FrequencyStepping StartFrequency="1.0" StopFrequency="18.0">
<LinearStepping Step="0.05" Units="MHz" />
</FrequencyStepping>
<RangeStepping StartRange="80.0" StopRange="1360.0" >
<LinearStepping Step="5.0" Units="km" />
</RangeStepping>
<AutoScaler Name="Artist5" Version="500200" ArtistFlags="2 2 0 0 0 0 0 0 0 22 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 85% PACIFIC flags: Multiple candidates for F2o cusp, One of F2 cusps was derived from the other</Comments>
<ContactPerson>
<Name>Dr. Mangalathayil Ali Abdu</Name>
<Affiliation>INPE, Division of Aeronomy</Affiliation>
<Address>Av dos Astronautas, 1.758 Jd. Granja - CEP: 12227-010 Sao Jose dos Campos - SP Brasil</Address>
<Email>maabdu@dae.inpe.br</Email>
</ContactPerson>
<StartTime Format="yyyy.MM.dd (DDD) HH:mm:ss" TimeZone="Coordinated Universal Time" >
2026.04.02 (092) 15:30:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.19" Model="IGRF 3.0" Altitude="300"/>
<DeclinationAngle Val="-19.74" Model="IGRF 3.0" Altitude="300"/>
<SunSpotNumber Val="-1.0" Status="predicted"/>
</SolarTerrestrialData>
<DigisondePreface Format="FF">
FF202609204021530009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="25" >
<URSI ID="00" Val="12.700" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.709" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="34.409" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="5.900" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="5.900" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="13.000" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="300.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="300.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="90" Val="110.000" Name="hmE" Units="km" QL="/" DL="/" />
<URSI ID="83" Val="20.000" Name="yE" Units="km" QL="/" DL="/" />
<URSI ID="86" Val="0.200" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="11.650" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="430.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="3.389" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="5.900" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="5.900" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.360" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="341.854" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="251.030" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.687" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="121.832" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="59.235" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="67.727" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="153.990" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.310" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="137">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
5.9 5.95 6.0 6.05 6.1 6.15 6.2 6.25 6.3 6.35 6.4 6.45 6.5 6.55 6.6 6.65 6.7 6.75 6.8 6.85 6.9 6.95 7.0 7.05 7.1 7.15 7.2 7.25 7.3 7.35 7.4 7.45 7.5 7.55 7.6 7.65 7.7 7.75 7.8 7.85 7.9 7.95 8.0 8.05 8.1 8.15 8.2 8.25 8.3 8.35 8.4 8.45 8.5 8.55 8.6 8.65 8.7 8.75 8.8 8.85 8.9 8.95 9.0 9.05 9.1 9.15 9.2 9.25 9.3 9.35 9.4 9.45 9.5 9.55 9.6 9.65 9.7 9.75 9.8 9.85 9.9 9.95 10.0 10.05 10.1 10.15 10.2 10.25 10.3 10.35 10.4 10.45 10.5 10.55 10.6 10.65 10.7 10.75 10.8 10.85 10.9 10.95 11.0 11.05 11.1 11.15 11.2 11.25 11.3 11.35 11.4 11.45 11.5 11.55 11.6 11.65 11.7 11.75 11.8 11.85 11.9 11.95 12.0 12.05 12.1 12.15 12.2 12.25 12.3 12.35 12.4 12.45 12.5 12.55 12.6 12.65 12.7
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
300.000 300.556 301.111 301.667 302.222 302.778 303.333 303.889 304.444 305.000 305.000 305.000 305.000 310.000 310.000 310.000 310.000 310.000 310.000 315.000 315.000 315.000 315.000 315.000 315.000 320.000 320.000 320.000 320.000 320.000 320.000 325.000 325.000 325.000 325.000 325.000 330.000 330.000 330.000 330.000 330.000 330.000 330.000 332.500 335.000 335.000 335.000 340.000 340.000 340.000 340.000 340.000 345.000 345.000 345.000 350.000 350.000 350.000 350.000 350.000 355.000 355.000 355.000 356.250 357.500 358.750 360.000 360.000 360.000 365.000 365.000 370.000 370.000 365.000 370.000 370.000 370.000 375.000 375.000 375.000 377.500 380.000 380.000 380.000 382.500 385.000 387.500 390.000 390.000 390.000 390.000 395.000 396.667 398.333 400.000 401.667 403.333 405.000 405.000 405.000 405.000 405.000 407.500 410.000 412.500 415.000 420.000 423.333 426.667 430.000 430.000 435.000 437.500 440.000 440.000 430.000 450.000 450.000 455.000 455.000 460.000 465.000 470.000 475.000 475.000 480.000 485.000 490.000 495.000 505.000 510.000 515.000 525.000 534.843 546.080 559.029 574.114
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
45 0 0 0 0 0 0 0 0 54 57 57 57 60 0 60 63 60 57 63 63 63 63 60 57 63 66 66 66 63 60 66 66 66 66 63 66 0 63 66 63 69 57 0 69 66 63 69 69 66 63 60 69 69 66 66 69 72 72 69 72 72 72 0 0 48 66 66 66 66 66 54 57 66 69 54 66 63 42 66 0 60 45 63 0 60 45 48 51 0 57 51 0 0 0 0 0 45 48 0 54 51 0 54 0 54 54 0 0 48 54 48 0 51 57 42 51 60 57 57 60 57 0 54 57 57 54 54 57 57 57 54 51 51 42 45 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 0.390625 -0.390625 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 1.953125 -0.390625 -0.390625 -1.171875 -1.171875 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -1.953125 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 1.171875 0.390625 -0.390625 0.390625 -2.734375 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -1.171875 -0.390625 -1.171875 -0.390625 -0.390625 -2.734375 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="188">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
89.484 90.0 95.0 100.0 105.0 110.0 111.554 113.108 114.662 115.0 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 341.854 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.241 2.28 2.933 3.279 3.389 3.266 3.266 3.389 3.407 3.64 3.845 4.035 4.219 4.398 4.575 4.752 4.93 5.109 5.29 5.473 5.659 5.848 6.041 6.238 6.438 6.643 6.852 7.065 7.283 7.505 7.732 7.963 8.198 8.438 8.682 8.929 9.18 9.433 9.689 9.947 10.206 10.465 10.723 10.978 11.228 11.472 11.705 11.925 12.128 12.307 12.459 12.578 12.659 12.697 12.7 12.697 12.683 12.655 12.616 12.566 12.505 12.434 12.354 12.265 12.168 12.064 11.952 11.835 11.711 11.583 11.449 11.312 11.17 11.025 10.877 10.726 10.573 10.418 10.262 10.104 9.945 9.786 9.626 9.466 9.306 9.146 8.986 8.828 8.67 8.512 8.356 8.201 8.048 7.895 7.745 7.596 7.448 7.302 7.158 7.016 6.876 6.737 6.601 6.467 6.334 6.204 6.076 5.95 5.825 5.703 5.583 5.466 5.35 5.236 5.124 5.015 4.907 4.801 4.698 4.596 4.496 4.399 4.303 4.209 4.117 4.027 3.938 3.852 3.767 3.684 3.602 3.522 3.444 3.368 3.293 3.22 3.148 3.078 3.009 2.942 2.876 2.812 2.749 2.687 2.627 2.568 2.51 2.454 2.399 2.345 2.292 2.24 2.19 2.14 2.092 2.045 1.998 1.953 1.909 1.866 1.824 1.782 1.742 1.703 1.664 1.626 1.589 1.553 1.518 1.484 1.45 1.417 1.385 1.353 1.323 1.293 1.263 1.235 1.207 1.179 1.152 1.126 1.1 1.075 1.051 1.027 1.004

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="3.389" PeakHeight="110.0" Num="3" Error="0.0">
-30.499 13.15 -3.167
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="3.389" EndFrequency="12.7" PeakHeight="341.854" Num="5" zHalfNm="251.03" Error="4.328">
-193.6 -45.59 10.575 0.697 0.726
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="4.662" Depth="0.123"/>
<TopsideChapman PeakHeight="341.854" PeakDensity="2001116.6" PeakScaleHeight="67.727" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
